如图,在边长为4的正方形ABCD中,点E是AB的中点,点F是BC的中点,点P是AD上的动点,将
分别沿DE,DF折起,使A,C两点重合于点G,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/95d4dd4e-10e0-4e6c-81ed-d7c1946d7514.png?resizew=373)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d9bc485051e6b8f7e5bdbc533da53f83.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/21/95d4dd4e-10e0-4e6c-81ed-d7c1946d7514.png?resizew=373)
A.BG⊥EF |
B.G到平面DEF的距离为![]() |
C.若BG∥面EFP,则二面角D−EF−P的余弦值为![]() |
D.四面体G−DEF外接球表面积为![]() |
更新时间:2023-07-17 14:52:40
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【推荐1】如图,八面体的每个面都是正三角形,并且4个顶点
在同一个平面内,如果四边形
是边长为2的正方形,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
A.异面直线AE与DF所成角的大小为![]() | B.平面![]() ![]() |
C.此八面体一定存在外接球 | D.此八面体的内切球表面积为![]() |
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【推荐2】已知三棱锥
的四个顶点都在球
上,
,
,平面
平面
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca37feb165ab4711a42c47fe929e5624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bfbec74e5ba41d4a9f75d675f4ff4472.png)
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A.直线![]() ![]() | B.![]() ![]() ![]() |
C.球![]() ![]() | D.三棱锥![]() ![]() |
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【推荐1】已知正方体
的棱长为4,点
分别是
的中点则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67d21d8a98dc01c5f1c792ba6e383b21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab55737740874f990841ae583c81e2a7.png)
A.直线![]() | B.平面![]() ![]() |
C.三棱锥![]() ![]() | D.三棱锥![]() ![]() |
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【推荐2】如图,在长方体
中,
,
,
为
的中点,
是
上一点,
是平面
上一点,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/7/12/76546a65-27e4-4bda-80f6-66e0d8b32c5c.png?resizew=211)
A.长方体![]() ![]() |
B.![]() |
C.![]() ![]() |
D.![]() ![]() |
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【推荐1】在三棱锥
中,
是边长为2的等边三角形,且
,
,
,下列说法中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/41e5db1d2fd912f77923e4c120a7dc19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72e49817548cb45b3d1e58570644c6fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6084d6c6c6c353a21f04110e9dfbfbeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26589bf4887e62a7b04ef732a006f3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb4e70017618c1d1a247f09b48505f33.png)
A.三棱锥S-ABC为正三棱锥 | B.三棱锥S-ABC的体积为![]() |
C.二面角S-AB-C的大小为![]() | D.三棱锥S-ABC的外接球表面积为![]() |
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【推荐2】由等边三角形组成的网格如图所示,多边形
是某几何体的表面展开图,对于该几何体(顶点的字母用展开图相应字母表示,对于重合的两点,取字母表中靠前的字母表示),下列结论中不正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/2/24/2664892317851648/2671505456799744/STEM/d4b49ad8e8e14a7788b4714d5292b08e.png?resizew=373)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb2e18b5f1de39b84bdaa6a73d0ee2b8.png)
![](https://img.xkw.com/dksih/QBM/2021/2/24/2664892317851648/2671505456799744/STEM/d4b49ad8e8e14a7788b4714d5292b08e.png?resizew=373)
A.![]() ![]() |
B.平面![]() ![]() |
C.平面![]() ![]() |
D.![]() |
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【推荐1】在棱长为2的正方体
中,AC与BD交于点O,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
A.![]() ![]() |
B.三棱锥![]() ![]() |
C.三角形![]() |
D.三棱锥![]() |
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【推荐2】如图1,在边长为2的正方形
中,
,
分别是
,
的中点,将
,
,
分别沿
,
,
折起,使
,
,
重合于点
,得到如图2所示的三棱锥
,则下列结论正确的是( )
![](https://img.xkw.com/dksih/QBM/2020/8/2/2519304753291264/2519961760112640/STEM/f76bd8b6458748da992ed309decc56a8.png?resizew=245)
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A.![]() |
B.平面![]() ![]() |
C.二面角![]() ![]() |
D.点![]() ![]() ![]() |
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